ATC

Check pin 9 is 12v (pin3 earth) it's a live feed which is used for ATC. It should have a 20 A fuse, could be in line or piggybacked in the cars fuse box.

https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.alko-tech.com/sites/default/files/uploaded_files/UK/Brochures/BrochurePDFs/atc_handbook.pdf&ved=2ahUKEwj814iD99TvAhXCoFwKHbhvCAAQFjABegQIBBAC&usg=AOvVaw2nF5SGNywjdkHr_-dLVkDM

I take it the brand new Bailey is for delivery next year? according to reports in the media ,stocks of L/Vs at dealers are non existant this year with the big surge in Staycations and most L/Vs coming self contained with their own toilet/shower to minimise "sharing" facilities when away